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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It depends on what you're working on. If this function were part of a website backend counting characters in usernames or something, it doesn't really matter at all. But if this is a helper function that is responsible for comparing billions of base pairs in genetic sequencing or part of a stock trading platform where microseconds matter, then you need to rethink it.
Would it matter? I assume itll be a O(2n) vs O(n) but I'm not sure if that's a big deal.
There should no need to put the alphabet in the description, because the alphabet is made available to you as a preloaded variable. Just use the variable, instead of typing in all the alphabet, or copy/pasting it from description.